I was wondering if anyone could clear up the rules of the 100% run? Does it mean all 100 steam achievements or just certain ones? How would you show that you actually got these achievements, especially when you already have them? I'm not the brightest.

all 100

it is recommended that you reset your steam achievements for runs

Maybe we should rename it to All Achievements so it's not gonna be that confusive anymore? Idk

For showing achievements you can capture not the game but window or a full screen and reset your achievements using SAM or create a new account.